Research On The Control Strategy Of Single-Phase PV Inverter

At present, the energy crisis and environmental pollution problems have became one of the most challenging problems which humanity must to face. To solve this growing problem, the governments of the world have focused on the development and utilization of new energy. Solar energy has been one of the most concerned energy sources between the governments and the people with its unique advantages; therefore, the solar power industry has made a rapid development.In this paper, firstly, a summary about the research on the solar power inverter control techniques is given; then, the overall design of single-phase photovoltaic inverter is given, including the choice of the inverter type, DC/DC circuit, the filter circuit topology and so on, the design of main circuit parameters is given. Secondly, on the base of the analysis of the main control objectives and the control techniques, the SPWM current control structure is selected and the design of PR controller is given. Thirdly, a brief introduction of the standard H-infinity control problem is given, by setting the mixed sensitivity performance indicators, this paper designs a H-infinity current controller; Fourthly, the system simulation platform is built in MATLAB software, the simulation result shows that the PR controller and the H-infinity controller have a good performance. Finally, the dissertation is summarized and the direction of further research is pointed out.